Santo And Blue Demon vs The Monsters (1970)

aka: Santo Y Blue Demon Contra Los Monstruos

In this adventure, Dr. Bruno Halder (Carlos Ancira), a recently deceased scientist, is returned to the land of the living by his hunchbacked midget assistant (Santanón) and a small army of green-faced zombies. The good doctor wants revenge against Santo and Blue Demon for some odd reason. To accomplish this, he creates an evil duplicate of Blue Demon (Alejandro Cruz) and then revives a pantheon of classic monsters like the Mummy (Fernando Rosales), Werewolf (Vicente Lara), Dracula (David Alvizu), Frankenstein (Manuel Leal) and a Cyclops (Gerardo Zepeda) to wreck havoc and do battle. (In Spanish language, with English subtitles).